Time means many things in many contexts. It is a sense of change for an intelligence, it is an independent variable for a dynamics equation, it is a piece of geometry for gravity, it is an operator for quantum mechanics, and it is the fundamental observable for relativity. Can you be a bit more specific? You see, the real problem here, though I may sound like a broken record to some (but it proves yet again why this is so important to say), that questions like "in what form does __(fill in a scientific concept)___ really exist?" are not meaningful questions. They have to be expressed like "how is __(fill in the scientific concept)__ used in ___(fill in a scientific theory)__ to help us understand something objective about our reality?" Put the question like that, and it can have a scientific answer.